公开(公告)号：US11667982B2

公开(公告)日：2023-06-06

申请号：US17476501

申请日：2021-09-16

Applicant: University of Science and Technology Beijing ,  Soochow University

Inventor： Rong Zhu ,  Shaoyan Hu ,  Kai Dong ,  Rongfang Su ,  Weifeng Li

IPC: C21C5/46 ,  C21C5/48 ,  F27D3/16 ,  C21C5/30

CPC classification number: C21C5/4606 ,  C21C5/30 ,  C21C5/48 ,  F27D3/16 ,  F27D2003/164 ,  F27D2003/168

Abstract: A long-life service method for powder-bottom-injecting converter based on collaborative hot replacement of furnace bottom and bottom purging brick belongs to the field of steelmaking technologies using powder-bottom-injecting converters. According to equipment characteristics, process characteristics, and erosion characteristics of the powder-bottom-injecting converter, the design, arrangement, installation, use, maintenance, and replacement of the bottom purging/powder injection bricks are systematically optimized and improved, a technology of automatically detecting the erosion height of bottom purging bricks is adopted, and hot replacement of bottom purging/powder injection bricks and hot replacement of the converter furnace bottom are used collaboratively, which not only can prolong the service life of a single bottom purging/powder injection brick, but also can greatly prolong the overall life of the powder-bottom-injecting converter from 1000-3000 heats in the prior art to 6000-10000 heats. Hence, the life of the powder-bottom-injecting converter is as long as that of a conventional converter.

公开(公告)号：US10988818B2

公开(公告)日：2021-04-27

申请号：US16926483

申请日：2020-07-10

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： Rong Zhu ,  Shaoyan Hu ,  Kai Dong ,  Guangsheng Wei ,  Haoran Ma ,  Weifeng Li ,  Yun Zhou ,  Zhihui Li ,  Wenhe Wu ,  Baochen Han ,  Chao Feng ,  Rongfang Su

IPC: C21C5/30 ,  B01D53/38 ,  B01D53/76 ,  C01G31/02 ,  C21C5/36 ,  C21C5/46

Abstract: An efficient long-service-life blowing method include the steps of introducing vanadium extraction converter flue gas and decarburization converter flue gas into an oxygen combustor; obtaining first-purity CO2—N2 mixed gas through the vanadium extraction converter flue gas; obtaining second-purity CO2—N2 mixed gas through the decarburization converter flue gas; obtaining O2—CO2—N2 mixed gas through the decarburization converter flue gas; obtaining first-purity CO2 gas through the second-purity CO2—N2 mixed gas; and using the first-purity CO2—N2 mixed gas for bottom blowing of the vanadium extraction converter, using the second-purity CO2—N2 mixed gas as a carrier gas for blowing iron ore powder into the vanadium extraction converter, and using the O2—CO2—N2 mixed gas and the first-purity CO2 gas as a carrier gas for bottom blowing of the decarburization converter and bottom injecting of lime powder into the decarburization converter.

公开(公告)号：US11788160B2

公开(公告)日：2023-10-17

申请号：US17049449

申请日：2020-01-21

Applicant: University of Science and Technology Beijing

Inventor： Chao Feng ,  Rong Zhu ,  Guangsheng Wei ,  Baochen Han ,  Kai Dong ,  Xueliang Wang ,  Wenhe Wu ,  Shaoyan Hu ,  Weifeng Li ,  Juanjuan Jiang ,  Jianfeng Dong

IPC: C21C5/32 ,  C21C5/46

CPC classification number: C21C5/32 ,  C21C5/4673

Abstract: The present disclosure provides a converter CO2—O2 mixed injection smelting method and a fire point area temperature dynamic control method. The method realizes online monitoring through an infrared temperature sensor installed inside an oxygen lance, dynamically adjusts the mixing ratio of CO2 and O2 and the height of the oxygen lance position according to the fire point area temperature changes and process requirements in different smelting stages, so that the secondary smelting system interlockingly and dynamically controls the fire point area temperature and the molten pool heating rate.